fix(microservices): rmq should gracefully reconnect upon error

[kamilmysliwiec]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

What is the current behavior?

Issue Number: #10562

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[coveralls]

Pull Request Test Coverage Report for Build f7d53b20-5472-496d-a786-054887da2978

• 18 of 22 (81.82%) changed or added relevant lines in 1 file are covered.
• 5 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.03%) to 92.992%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/microservices/client/client-rmq.ts	18	22	81.82%

Files with Coverage Reduction	New Missed Lines	%
packages/microservices/client/client-rmq.ts	1	81.92%
packages/microservices/server/server-nats.ts	4	88.07%

Totals
Change from base Build ea25dfd5-fe51-42ae-b629-23996be1b77a:	0.03%
Covered Lines:	6383
Relevant Lines:	6864

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💛 - Coveralls